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i40e: Add basic support for get/set channels for RSS 

Implement the number of receive/transmit queue pair being
changed on the fly by ethtool.

Change-Id: I70df2363f1ca40b63610baa561c5b6b92b81bca7
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Kavindya Deegala <kavindya.s.deegala@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Anjali Singhai Jain 2013-11-26 11:59:30 +00:00 committed by Jeff Kirsher
parent f8ff14640a
commit 4b7820ca4f
1 changed files with 90 additions and 0 deletions
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90
drivers/net/ethernet/intel/i40e/i40e_ethtool.c
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@ -1472,6 +1472,94 @@ static int i40e_set_rxnfc(struct net_device *netdev, struct ethtool_rxnfc *cmd)
return ret;
}
/**
* i40e_max_channels - get Max number of combined channels supported
* @vsi: vsi pointer
**/
static unsigned int i40e_max_channels(struct i40e_vsi *vsi)
{
/* TODO: This code assumes DCB and FD is disabled for now. */
return vsi->alloc_queue_pairs;
}
/**
* i40e_get_channels - Get the current channels enabled and max supported etc.
* @netdev: network interface device structure
* @ch: ethtool channels structure
*
* We don't support separate tx and rx queues as channels. The other count
* represents how many queues are being used for control. max_combined counts
* how many queue pairs we can support. They may not be mapped 1 to 1 with
* q_vectors since we support a lot more queue pairs than q_vectors.
**/
static void i40e_get_channels(struct net_device *dev,
struct ethtool_channels *ch)
{
struct i40e_netdev_priv *np = netdev_priv(dev);
struct i40e_vsi *vsi = np->vsi;
struct i40e_pf *pf = vsi->back;
/* report maximum channels */
ch->max_combined = i40e_max_channels(vsi);
/* report info for other vector */
ch->other_count = (pf->flags & I40E_FLAG_FDIR_ENABLED) ? 1 : 0;
ch->max_other = ch->other_count;
/* Note: This code assumes DCB is disabled for now. */
ch->combined_count = vsi->num_queue_pairs;
}
/**
* i40e_set_channels - Set the new channels count.
* @netdev: network interface device structure
* @ch: ethtool channels structure
*
* The new channels count may not be the same as requested by the user
* since it gets rounded down to a power of 2 value.
**/
static int i40e_set_channels(struct net_device *dev,
struct ethtool_channels *ch)
{
struct i40e_netdev_priv *np = netdev_priv(dev);
unsigned int count = ch->combined_count;
struct i40e_vsi *vsi = np->vsi;
struct i40e_pf *pf = vsi->back;
int new_count;
/* We do not support setting channels for any other VSI at present */
if (vsi->type != I40E_VSI_MAIN)
return -EINVAL;
/* verify they are not requesting separate vectors */
if (!count || ch->rx_count || ch->tx_count)
return -EINVAL;
/* verify other_count has not changed */
if (ch->other_count != ((pf->flags & I40E_FLAG_FDIR_ENABLED) ? 1 : 0))
return -EINVAL;
/* verify the number of channels does not exceed hardware limits */
if (count > i40e_max_channels(vsi))
return -EINVAL;
/* update feature limits from largest to smallest supported values */
/* TODO: Flow director limit, DCB etc */
/* cap RSS limit */
if (count > pf->rss_size_max)
count = pf->rss_size_max;
/* use rss_reconfig to rebuild with new queue count and update traffic
* class queue mapping
*/
new_count = i40e_reconfig_rss_queues(pf, count);
if (new_count > 1)
return 0;
else
return -EINVAL;
}
static const struct ethtool_ops i40e_ethtool_ops = {
.get_settings = i40e_get_settings,
.get_drvinfo = i40e_get_drvinfo,
@ -1496,6 +1584,8 @@ static const struct ethtool_ops i40e_ethtool_ops = {
.get_ethtool_stats = i40e_get_ethtool_stats,
.get_coalesce = i40e_get_coalesce,
.set_coalesce = i40e_set_coalesce,
.get_channels = i40e_get_channels,
.set_channels = i40e_set_channels,
.get_ts_info = i40e_get_ts_info,
};